Trifluoroacetic acid → 2-{3-[2-(2-Fluoro-phenyl)-2-hydroxy-ethoxy]-4-methoxy-benzoylamino}-indane-2-carboxylic acid

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Reaction Steps

The title compound was prepared according to the general procedure described in example 125 using 0.25 g of resin (0.5 mmol/g). Attachment of the 2-amino-indane-2-carboxylic acid moiety to the resin was followed by acylation with 3-hydroxy-4-methoxy-benzoic acid and treatment with 50% piperidine in DMF for 2 h. After extensive washing with DMF and DCM the resin was reacted with 2-bromo-1-(2-fluoro-phenyl)-ethanone (3 equivalents) in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU; 3 equivalents) in 3 ml of DCM overnight at room temperature. The compound was cleaved from the resin with neat TFA for 2 h, and TFA was evaporated in vacuo. The crude intermediate product was dissolved in 4 ml of THF, 10 mg of lithium borohydride were added and the reaction mixture was shaken for 3 h. Then the reaction mixture was quenched with acetic acid, evaporated to dryness, and the residue was purified by preparative RP HPLC (water/ACN gradient). Yield: 3.7 mg.

Provenance & Evidence